$28,000 to the senator since 1992. now, we invited senator grassley to come "outfront," but so far, he's declined. there's the saying that guns don't kill people, video games do. senator grassley implies they make kids more violent. does it add up? william pollack is a psychologist and author of "real sons." sir, i really appreciate your taking the time. let me ask the point-blank question. a lot of people out there, with this is accepted as a fact, that all these violent games, and by the way, they are horrifically violent, is why we are seeing this seeming explosion in mass shootings. true? >> no, not true. i mean, i agree with the senator, we should put some controls on those violent video games, but they don't cause the shootings, anything more than one item does. but, when you have assault weapons and multiple magazine weapons, when someone goes in to shoot someone, they don't shoot one person, they shoot 20, 30, or 40 in a matter of seconds.